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From git-site-r...@apache.org
Subject [29/51] [partial] hbase-site git commit: Published site at 82d554e3783372cc6b05489452c815b57c06f6cd.
Date Fri, 11 Aug 2017 15:06:30 GMT
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/346adc37/devapidocs/org/apache/hadoop/hbase/master/assignment/RegionTransitionProcedure.html
----------------------------------------------------------------------
diff --git a/devapidocs/org/apache/hadoop/hbase/master/assignment/RegionTransitionProcedure.html b/devapidocs/org/apache/hadoop/hbase/master/assignment/RegionTransitionProcedure.html
index cda5289..9f98479 100644
--- a/devapidocs/org/apache/hadoop/hbase/master/assignment/RegionTransitionProcedure.html
+++ b/devapidocs/org/apache/hadoop/hbase/master/assignment/RegionTransitionProcedure.html
@@ -123,7 +123,7 @@ var activeTableTab = "activeTableTab";
 <hr>
 <br>
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-public abstract class <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/RegionTransitionProcedure.html#line.86">RegionTransitionProcedure</a>
+public abstract class <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/RegionTransitionProcedure.html#line.82">RegionTransitionProcedure</a>
 extends <a href="../../../../../../org/apache/hadoop/hbase/procedure2/Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/master/procedure/MasterProcedureEnv.html" title="class in org.apache.hadoop.hbase.master.procedure">MasterProcedureEnv</a>&gt;
 implements <a href="../../../../../../org/apache/hadoop/hbase/master/procedure/TableProcedureInterface.html" title="interface in org.apache.hadoop.hbase.master.procedure">TableProcedureInterface</a>, <a href="../../../../../../org/apache/hadoop/hbase/procedure2/RemoteProcedureDispatcher.RemoteProcedure.html" title="interface in org.apache.hadoop.hbase.procedure2">RemoteProcedureDispatcher.RemoteProcedure</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/master/procedure/MasterProcedureEnv.html" title="class in org.apache.hadoop.hbase.master.procedure">MasterProcedureEnv</a>,<a href="../../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;</pre>
 <div class="block">Base class for the Assign and Unassign Procedure.
@@ -134,6 +134,7 @@ implements <a href="../../../../../../org/apache/hadoop/hbase/master/procedure/T
  The AssignmentManager will notify this procedure when the RS completes
  the operation and reports the transitioned state
  (see the Assign and Unassign class for more detail).
+
  <p>Procedures move from the REGION_TRANSITION_QUEUE state when they are
  first submitted, to the REGION_TRANSITION_DISPATCH state when the request
  to remote server is sent and the Procedure is suspended waiting on external
@@ -153,20 +154,15 @@ implements <a href="../../../../../../org/apache/hadoop/hbase/master/procedure/T
  assignment to a different target server by setting <a href="../../../../../../org/apache/hadoop/hbase/master/assignment/AssignProcedure.html#forceNewPlan"><code>AssignProcedure.forceNewPlan</code></a>. When
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  the procedure is aborted. For <a href="../../../../../../org/apache/hadoop/hbase/master/assignment/UnassignProcedure.html" title="class in org.apache.hadoop.hbase.master.assignment"><code>UnassignProcedure</code></a>, similar re-attempts are
- intentionally not implemented. It is a 'one shot' procedure.
+ intentionally not implemented. It is a 'one shot' procedure. See its class doc for how it
+ handles failure.
  </li>
  </ul>
 
  <p>TODO: Considering it is a priority doing all we can to get make a region available as soon as possible,
  re-attempting with any target makes sense if specified target fails in case of
- <a href="../../../../../../org/apache/hadoop/hbase/master/assignment/AssignProcedure.html" title="class in org.apache.hadoop.hbase.master.assignment"><code>AssignProcedure</code></a>. For <a href="../../../../../../org/apache/hadoop/hbase/master/assignment/UnassignProcedure.html" title="class in org.apache.hadoop.hbase.master.assignment"><code>UnassignProcedure</code></a>, if communication with RS fails,
- similar re-attempt makes little sense (what should be different from previous attempt?). Also it
- could be complex with current implementation of
- <a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionTransitionProcedure.html#execute-org.apache.hadoop.hbase.master.procedure.MasterProcedureEnv-"><code>execute(MasterProcedureEnv)</code></a> and <a href="../../../../../../org/apache/hadoop/hbase/master/assignment/UnassignProcedure.html" title="class in org.apache.hadoop.hbase.master.assignment"><code>UnassignProcedure</code></a>.
- We have made a choice of keeping <a href="../../../../../../org/apache/hadoop/hbase/master/assignment/UnassignProcedure.html" title="class in org.apache.hadoop.hbase.master.assignment"><code>UnassignProcedure</code></a> simple, where the procedure either
- succeeds or fails depending on communication with RS. As parent will have broader context, parent
- can better handle the failed instance of <a href="../../../../../../org/apache/hadoop/hbase/master/assignment/UnassignProcedure.html" title="class in org.apache.hadoop.hbase.master.assignment"><code>UnassignProcedure</code></a>. Similar simplicity for
- <a href="../../../../../../org/apache/hadoop/hbase/master/assignment/AssignProcedure.html" title="class in org.apache.hadoop.hbase.master.assignment"><code>AssignProcedure</code></a> is desired and should be explored/ discussed further.</div>
+ <a href="../../../../../../org/apache/hadoop/hbase/master/assignment/AssignProcedure.html" title="class in org.apache.hadoop.hbase.master.assignment"><code>AssignProcedure</code></a>. For <a href="../../../../../../org/apache/hadoop/hbase/master/assignment/UnassignProcedure.html" title="class in org.apache.hadoop.hbase.master.assignment"><code>UnassignProcedure</code></a>, our concern is preventing data loss
+ on failed unassign. See class doc for explanation.</div>
 </li>
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+ running at a time, since each procedure takes a lock on the region.
 
  <p>The Unassign starts by placing a "close region" request in the Remote Dispatcher
- queue, and the procedure will then go into a "waiting state".
+ queue, and the procedure will then go into a "waiting state" (suspend).
  The Remote Dispatcher will batch the various requests for that server and
  they will be sent to the RS for execution.
  The RS will complete the open operation by calling master.reportRegionStateTransition().
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- The procedure will finish the unassign by publishing its new state on meta
- or it will retry the unassign.</div>
+ The AM will intercept the transition report, and notify this procedure.
+ The procedure will wakeup and finish the unassign by publishing its new state on meta.
+ <p>If we are unable to contact the remote regionserver whether because of ConnectException
+ or socket timeout, we will call expire on the server we were trying to contact. We will remain
+ in suspended state waiting for a wake up from the ServerCrashProcedure that is processing the
+ failed server. The basic idea is that if we notice a crashed server, then we have a
+ responsibility; i.e. we should not let go of the region until we are sure the server that was
+ hosting has had its crash processed. If we let go of the region before then, an assign might
+ run before the logs have been split which would make for data loss.
+
+ <p>TODO: Rather than this tricky coordination between SCP and this Procedure, instead, work on
+ returning a SCP as our subprocedure; probably needs work on the framework to do this,
+ especially if the SCP already created.</div>
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-<pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/UnassignProcedure.html#line.262">getServer</a>(<a href="../../../../../../org/apache/hadoop/hbase/master/procedure/MasterProcedureEnv.html" title="class in org.apache.hadoop.hbase.master.procedure">MasterProcedureEnv</a>&nbsp;env)</pre>
+<pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/UnassignProcedure.html#line.264">getServer</a>(<a href="../../../../../../org/apache/hadoop/hbase/master/procedure/MasterProcedureEnv.html" title="class in org.apache.hadoop.hbase.master.procedure">MasterProcedureEnv</a>&nbsp;env)</pre>
 <div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionTransitionProcedure.html#getServer-org.apache.hadoop.hbase.master.procedure.MasterProcedureEnv-">RegionTransitionProcedure</a></code></span></div>
 <div class="block">Used by ServerCrashProcedure to see if this Assign/Unassign needs processing.</div>
 <dl>
@@ -686,7 +687,7 @@ extends <a href="../../../../../../org/apache/hadoop/hbase/master/assignment/Reg
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 <h4>getProcedureMetrics</h4>
-<pre>protected&nbsp;<a href="../../../../../../org/apache/hadoop/hbase/procedure2/ProcedureMetrics.html" title="interface in org.apache.hadoop.hbase.procedure2">ProcedureMetrics</a>&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/UnassignProcedure.html#line.267">getProcedureMetrics</a>(<a href="../../../../../../org/apache/hadoop/hbase/master/procedure/MasterProcedureEnv.html" title="class in org.apache.hadoop.hbase.master.procedure">MasterProcedureEnv</a>&nbsp;env)</pre>
+<pre>protected&nbsp;<a href="../../../../../../org/apache/hadoop/hbase/procedure2/ProcedureMetrics.html" title="interface in org.apache.hadoop.hbase.procedure2">ProcedureMetrics</a>&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/UnassignProcedure.html#line.269">getProcedureMetrics</a>(<a href="../../../../../../org/apache/hadoop/hbase/master/procedure/MasterProcedureEnv.html" title="class in org.apache.hadoop.hbase.master.procedure">MasterProcedureEnv</a>&nbsp;env)</pre>
 <div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../../org/apache/hadoop/hbase/procedure2/Procedure.html#getProcedureMetrics-TEnvironment-">Procedure</a></code></span></div>
 <div class="block">Override this method to provide procedure specific counters for submitted count, failed
  count and time histogram.</div>

http://git-wip-us.apache.org/repos/asf/hbase-site/blob/346adc37/devapidocs/org/apache/hadoop/hbase/master/assignment/class-use/RegionStates.RegionStateNode.html
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diff --git a/devapidocs/org/apache/hadoop/hbase/master/assignment/class-use/RegionStates.RegionStateNode.html b/devapidocs/org/apache/hadoop/hbase/master/assignment/class-use/RegionStates.RegionStateNode.html
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+++ b/devapidocs/org/apache/hadoop/hbase/master/assignment/class-use/RegionStates.RegionStateNode.html
@@ -315,19 +315,19 @@
 </td>
 </tr>
 <tr class="altColor">
-<td class="colFirst"><code>protected void</code></td>
+<td class="colFirst"><code>protected boolean</code></td>
 <td class="colLast"><span class="typeNameLabel">UnassignProcedure.</span><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hbase/master/assignment/UnassignProcedure.html#remoteCallFailed-org.apache.hadoop.hbase.master.procedure.MasterProcedureEnv-org.apache.hadoop.hbase.master.assignment.RegionStates.RegionStateNode-java.io.IOException-">remoteCallFailed</a></span>(<a href="../../../../../../../org/apache/hadoop/hbase/master/procedure/MasterProcedureEnv.html" title="class in org.apache.hadoop.hbase.master.procedure">MasterProcedureEnv</a>&nbsp;env,
                 <a href="../../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStates.RegionStateNode.html" title="class in org.apache.hadoop.hbase.master.assignment">RegionStates.RegionStateNode</a>&nbsp;regionNode,
                 <a href="http://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>&nbsp;exception)</code>&nbsp;</td>
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 <tr class="rowColor">
-<td class="colFirst"><code>protected abstract void</code></td>
+<td class="colFirst"><code>protected abstract boolean</code></td>
 <td class="colLast"><span class="typeNameLabel">RegionTransitionProcedure.</span><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hbase/master/assignment/RegionTransitionProcedure.html#remoteCallFailed-org.apache.hadoop.hbase.master.procedure.MasterProcedureEnv-org.apache.hadoop.hbase.master.assignment.RegionStates.RegionStateNode-java.io.IOException-">remoteCallFailed</a></span>(<a href="../../../../../../../org/apache/hadoop/hbase/master/procedure/MasterProcedureEnv.html" title="class in org.apache.hadoop.hbase.master.procedure">MasterProcedureEnv</a>&nbsp;env,
                 <a href="../../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStates.RegionStateNode.html" title="class in org.apache.hadoop.hbase.master.assignment">RegionStates.RegionStateNode</a>&nbsp;regionNode,
                 <a href="http://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>&nbsp;exception)</code>&nbsp;</td>
 </tr>
 <tr class="altColor">
-<td class="colFirst"><code>protected void</code></td>
+<td class="colFirst"><code>protected boolean</code></td>
 <td class="colLast"><span class="typeNameLabel">AssignProcedure.</span><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hbase/master/assignment/AssignProcedure.html#remoteCallFailed-org.apache.hadoop.hbase.master.procedure.MasterProcedureEnv-org.apache.hadoop.hbase.master.assignment.RegionStates.RegionStateNode-java.io.IOException-">remoteCallFailed</a></span>(<a href="../../../../../../../org/apache/hadoop/hbase/master/procedure/MasterProcedureEnv.html" title="class in org.apache.hadoop.hbase.master.procedure">MasterProcedureEnv</a>&nbsp;env,
                 <a href="../../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStates.RegionStateNode.html" title="class in org.apache.hadoop.hbase.master.assignment">RegionStates.RegionStateNode</a>&nbsp;regionNode,
                 <a href="http://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>&nbsp;exception)</code>&nbsp;</td>

http://git-wip-us.apache.org/repos/asf/hbase-site/blob/346adc37/devapidocs/org/apache/hadoop/hbase/master/assignment/class-use/RegionTransitionProcedure.html
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diff --git a/devapidocs/org/apache/hadoop/hbase/master/assignment/class-use/RegionTransitionProcedure.html b/devapidocs/org/apache/hadoop/hbase/master/assignment/class-use/RegionTransitionProcedure.html
index 8bdc2f0..e1db7db 100644
--- a/devapidocs/org/apache/hadoop/hbase/master/assignment/class-use/RegionTransitionProcedure.html
+++ b/devapidocs/org/apache/hadoop/hbase/master/assignment/class-use/RegionTransitionProcedure.html
@@ -111,7 +111,7 @@
 <tr class="rowColor">
 <td class="colFirst"><code>class&nbsp;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hbase/master/assignment/UnassignProcedure.html" title="class in org.apache.hadoop.hbase.master.assignment">UnassignProcedure</a></span></code>
-<div class="block">Procedure that describe the unassignment of a single region.</div>
+<div class="block">Procedure that describes the unassignment of a single region.</div>
 </td>
 </tr>
 </tbody>


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